Football clock



FIG. 1 shows a front elevational view of my design for a football clock;

FIG. 2 shows a rear elevational view thereof; and,

FIG. 3 is a side elevation as seen from the right side of FIG. 1.

The broken lines in the drawings are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a football clock, as shown and described. 